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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf620b07e655ccf1ac7ce4c68c2d5ec1a18bb6d83850c3e379883f055d0ec5df' 
  AND token = 'xS9VS2oQxYrH6lKkjGimhThEiZOECp7KLlOMlOMO6AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}